公开(公告)号：US20030135866A1

公开(公告)日：2003-07-17

申请号：US10047187

申请日：2002-01-17

Applicant: ASKEY COMPUTER CORP.

Inventor： Chi-Tung Hsu

IPC: H04N007/173

CPC classification number: H04L12/2801 ,  H03J1/0075 ,  H03J2200/28

Abstract: A downstream power calibration method comprises the following procedures. First, select base sampling frequencies and sampling power levels, thereby generating base sampling signals. Next, input base sampling signals into a modem such that obtaining each sum of the feedback signals responding to the tuner and the IF amplifier of the modem by the modem chip corresponding each said base sampling signal, thereby setting up a sampling data table. Third, repeat the procedure mention above for a plurality of modems to get a plurality of sampling data tables respectively, and then obtain a mean data table. Fourth, select spot frequencies and spot power levels from the base sampling frequencies and the base sampling power levels to generate spot sampling signals. Thereafter, input the spot sampling signals into a cable modem and set up a skeleton data table. Finally, expand skeleton data table and obtain an individual default data table for the modem, thereby providing the basis of the calculation of power levels when the cable modem is receiving downstream signals.

Abstract translation: 下游功率校准方法包括以下步骤。 首先，选择基本采样频率和采样功率电平，从而生成基本采样信号。 接下来，将输入基本采样信号转换成调制解调器，使得通过调制解调器芯片获得响应调谐器的调谐器和IF放大器的每个所述基本采样信号的每个和的反馈信号，从而建立采样数据表。 第三，对于多个调制解调器重复上述步骤以分别获得多个采样数据表，然后获得平均数据表。 第四，从基本采样频率和基本采样功率电平中选择频点和点功率电平，以产生点采样信号。 此后，将采样信号输入电缆调制解调器，并设置骨架数据表。 最后，扩展骨架数据表，并获得调制解调器的单个默认数据表，从而为电缆调制解调器接收下行信号提供功率电平计算的基础。